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# Chemical Equilibrium online test as an assignmnet IIT JAM Notes | EduRev

## IIT JAM : Chemical Equilibrium online test as an assignmnet IIT JAM Notes | EduRev

``` Page 1

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
Chemical Equilibrium Online Test (18
th
Dec, 16)

1. Consider the phase diagram given below:

At the intersection point Q has phases that are in equilibrium are
(a) Solid A, solid B and solid AB
2
.  (b) Solid A, solid AB
2
and liquid
(c) Solid B, solid AB
2
and liquid  (d) Solid A, solid B, solid AB
2
and
liquid
2. For the following equilibrium: calculate the equilibrium
constant, if for the equilibrium,
The equilibrium constant is 5.5 × 10
-10.
(a) 1.8 × 10
-4
(b) 1.8 × 10
-5
(c) 1.8 ×10
-6
(d) 1.8 ×10
-7

3. The elevation in boiling point of a solution of 10 g of a binary electrolyte (molecular mass
100) in 100 g of water is ? T
b
. The value of K
b
for water is:
(a)    (b) 10   (c) 1 0 ? T
b
(d)

4. For the reaction, if percentage dissociation of N
2
O
4
are 25%, 50%,
75% and 100%, then the sequence of observed vapour densities will be:
(a) d
1
> d
2
> d
3
> d
4
(b) d
4
> d
3
> d
2
> d
1

(c) d
1
= d
2
= d
3
= d
4
(d) (d
1
= d
2
) > (d
3
= d
4
)

5. For the reaction, if the initial concentration of [H
2
] = [CO
2
]
and x mol/litre of H
2
is consumed at equilibrium, the correct expression of K
p
is:
(a)   (b)   (c)   (d)

Page 2

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
Chemical Equilibrium Online Test (18
th
Dec, 16)

1. Consider the phase diagram given below:

At the intersection point Q has phases that are in equilibrium are
(a) Solid A, solid B and solid AB
2
.  (b) Solid A, solid AB
2
and liquid
(c) Solid B, solid AB
2
and liquid  (d) Solid A, solid B, solid AB
2
and
liquid
2. For the following equilibrium: calculate the equilibrium
constant, if for the equilibrium,
The equilibrium constant is 5.5 × 10
-10.
(a) 1.8 × 10
-4
(b) 1.8 × 10
-5
(c) 1.8 ×10
-6
(d) 1.8 ×10
-7

3. The elevation in boiling point of a solution of 10 g of a binary electrolyte (molecular mass
100) in 100 g of water is ? T
b
. The value of K
b
for water is:
(a)    (b) 10   (c) 1 0 ? T
b
(d)

4. For the reaction, if percentage dissociation of N
2
O
4
are 25%, 50%,
75% and 100%, then the sequence of observed vapour densities will be:
(a) d
1
> d
2
> d
3
> d
4
(b) d
4
> d
3
> d
2
> d
1

(c) d
1
= d
2
= d
3
= d
4
(d) (d
1
= d
2
) > (d
3
= d
4
)

5. For the reaction, if the initial concentration of [H
2
] = [CO
2
]
and x mol/litre of H
2
is consumed at equilibrium, the correct expression of K
p
is:
(a)   (b)   (c)   (d)

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
6. H
3
PO
4
is a tribasic acid, it undergoes ionization as:

Then, equilibrium constant for the followimg reaction will be:
(a) K
1
K
2
K
3
(b)

(c)

(d)
7. The equilibrium constant for the reaction is 5. How many moles of CO
2
litre container already containing 3 moles each of CO and H
2
O to make 2M equilibrium
concentration of CO?
(a) 15   (b) 19   (c) 5   (d) 20

8. A nitrogen–hydrogen mixture initially in the molar ratio of 1:3 reacted equilibrium to form
ammonia when 25% of the N
2
and H
2
had reached. If the total pressure of the system was 21
atm, the partial pressure of ammonia at the equilibrium was:
(a) 4.5 atm   (b) 3.0 atm  (c) 2.0 atm  (d) 1.5 atm

9. The freezing point depression constant for water is 1.86°C m
–1
. If 5 g Na
2
SO
4
is dissolved in
45 g H
2
O, the freezing point is changed by –3.82°C. Calculate the van't Hoff factor for
Na
2
SO
4.

(a) 0.381   (b) 2.05  (c) 2.63  (d) 3.11

10. K
sp(AgCl)
> K
sp(AgBr)
> K
sp(AgI)
. This means that:
(a) AgCl is more ionized than AgBr and AgI
(b) Both AgBr & AgI are less soluble than AgCl
(c) AgI is most soluble
(d) AgBr is more soluble than AgCl but less soluble then AgI

11. The triple point for water is:
(a) Unique      (b) Depends on a p but is independent of T
(c) Depends on T but is independent of P  (d) Depends on both P & T

12. At 25°C, the volue of Pk
b
(K
b
being the dissociation constant as a base) for NH
3
in aqueous
solution is 4.7. What is the pH of 0.1 M aqueous solution of NH
4
Cl with 0.01 M
NH
3
(approxmately):
Page 3

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
Chemical Equilibrium Online Test (18
th
Dec, 16)

1. Consider the phase diagram given below:

At the intersection point Q has phases that are in equilibrium are
(a) Solid A, solid B and solid AB
2
.  (b) Solid A, solid AB
2
and liquid
(c) Solid B, solid AB
2
and liquid  (d) Solid A, solid B, solid AB
2
and
liquid
2. For the following equilibrium: calculate the equilibrium
constant, if for the equilibrium,
The equilibrium constant is 5.5 × 10
-10.
(a) 1.8 × 10
-4
(b) 1.8 × 10
-5
(c) 1.8 ×10
-6
(d) 1.8 ×10
-7

3. The elevation in boiling point of a solution of 10 g of a binary electrolyte (molecular mass
100) in 100 g of water is ? T
b
. The value of K
b
for water is:
(a)    (b) 10   (c) 1 0 ? T
b
(d)

4. For the reaction, if percentage dissociation of N
2
O
4
are 25%, 50%,
75% and 100%, then the sequence of observed vapour densities will be:
(a) d
1
> d
2
> d
3
> d
4
(b) d
4
> d
3
> d
2
> d
1

(c) d
1
= d
2
= d
3
= d
4
(d) (d
1
= d
2
) > (d
3
= d
4
)

5. For the reaction, if the initial concentration of [H
2
] = [CO
2
]
and x mol/litre of H
2
is consumed at equilibrium, the correct expression of K
p
is:
(a)   (b)   (c)   (d)

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
6. H
3
PO
4
is a tribasic acid, it undergoes ionization as:

Then, equilibrium constant for the followimg reaction will be:
(a) K
1
K
2
K
3
(b)

(c)

(d)
7. The equilibrium constant for the reaction is 5. How many moles of CO
2
litre container already containing 3 moles each of CO and H
2
O to make 2M equilibrium
concentration of CO?
(a) 15   (b) 19   (c) 5   (d) 20

8. A nitrogen–hydrogen mixture initially in the molar ratio of 1:3 reacted equilibrium to form
ammonia when 25% of the N
2
and H
2
had reached. If the total pressure of the system was 21
atm, the partial pressure of ammonia at the equilibrium was:
(a) 4.5 atm   (b) 3.0 atm  (c) 2.0 atm  (d) 1.5 atm

9. The freezing point depression constant for water is 1.86°C m
–1
. If 5 g Na
2
SO
4
is dissolved in
45 g H
2
O, the freezing point is changed by –3.82°C. Calculate the van't Hoff factor for
Na
2
SO
4.

(a) 0.381   (b) 2.05  (c) 2.63  (d) 3.11

10. K
sp(AgCl)
> K
sp(AgBr)
> K
sp(AgI)
. This means that:
(a) AgCl is more ionized than AgBr and AgI
(b) Both AgBr & AgI are less soluble than AgCl
(c) AgI is most soluble
(d) AgBr is more soluble than AgCl but less soluble then AgI

11. The triple point for water is:
(a) Unique      (b) Depends on a p but is independent of T
(c) Depends on T but is independent of P  (d) Depends on both P & T

12. At 25°C, the volue of Pk
b
(K
b
being the dissociation constant as a base) for NH
3
in aqueous
solution is 4.7. What is the pH of 0.1 M aqueous solution of NH
4
Cl with 0.01 M
NH
3
(approxmately):

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
(a) 8.3   (b) 9   (c) 9.5   (d) 10

13. The solution of CaF
2
(K
sp
= 3.4 × 10
–11
) in 0.1 M solution of NaF would be:
(a) 3.4 × 10
–12
M  (b) 3.4 × 10
–10
M (c) 3.4 × 10
–9
M (d) 3.4 × 10
–13
M

14. For the chemical equilibrium can be determined from which one of the following plots?
(a)  (b) (c) (d)

15. On adding 0.1 M solution each of Ag
+
, Ba
2+
and Ca
2+
in an Na
2
SO
4
solution, the species first
precipitated is (K
sp
BaSO
4
= 10
–11
, K
sp
CaSO
4
= 10
–6
, K
sp
Ag
2
SO
4
= 10
–5
):
(a) Ag
2
SO
4
(b) BaSO
4
(c) CaSO
4
(d) All of these

16. Which of the following expression for % ionization of a mono-acidic base (BOH) in aqueous
solution at appreciable concentration is correct?
(a)     (b)
(c)    (d)

17. Which of the Following is/are affected by pressure change?
(a) (b)
(c)          (d)

18. A buffer solution can be prepared from a mixture of?
(a) Sodium acetate and acetic acid in water
(b) Sodium acetate and HCl in water
(c) Ammonia and ammonium chloride in water
(d) Ammonia and sodium hydroxide in water.

Page 4

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
Chemical Equilibrium Online Test (18
th
Dec, 16)

1. Consider the phase diagram given below:

At the intersection point Q has phases that are in equilibrium are
(a) Solid A, solid B and solid AB
2
.  (b) Solid A, solid AB
2
and liquid
(c) Solid B, solid AB
2
and liquid  (d) Solid A, solid B, solid AB
2
and
liquid
2. For the following equilibrium: calculate the equilibrium
constant, if for the equilibrium,
The equilibrium constant is 5.5 × 10
-10.
(a) 1.8 × 10
-4
(b) 1.8 × 10
-5
(c) 1.8 ×10
-6
(d) 1.8 ×10
-7

3. The elevation in boiling point of a solution of 10 g of a binary electrolyte (molecular mass
100) in 100 g of water is ? T
b
. The value of K
b
for water is:
(a)    (b) 10   (c) 1 0 ? T
b
(d)

4. For the reaction, if percentage dissociation of N
2
O
4
are 25%, 50%,
75% and 100%, then the sequence of observed vapour densities will be:
(a) d
1
> d
2
> d
3
> d
4
(b) d
4
> d
3
> d
2
> d
1

(c) d
1
= d
2
= d
3
= d
4
(d) (d
1
= d
2
) > (d
3
= d
4
)

5. For the reaction, if the initial concentration of [H
2
] = [CO
2
]
and x mol/litre of H
2
is consumed at equilibrium, the correct expression of K
p
is:
(a)   (b)   (c)   (d)

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
6. H
3
PO
4
is a tribasic acid, it undergoes ionization as:

Then, equilibrium constant for the followimg reaction will be:
(a) K
1
K
2
K
3
(b)

(c)

(d)
7. The equilibrium constant for the reaction is 5. How many moles of CO
2
litre container already containing 3 moles each of CO and H
2
O to make 2M equilibrium
concentration of CO?
(a) 15   (b) 19   (c) 5   (d) 20

8. A nitrogen–hydrogen mixture initially in the molar ratio of 1:3 reacted equilibrium to form
ammonia when 25% of the N
2
and H
2
had reached. If the total pressure of the system was 21
atm, the partial pressure of ammonia at the equilibrium was:
(a) 4.5 atm   (b) 3.0 atm  (c) 2.0 atm  (d) 1.5 atm

9. The freezing point depression constant for water is 1.86°C m
–1
. If 5 g Na
2
SO
4
is dissolved in
45 g H
2
O, the freezing point is changed by –3.82°C. Calculate the van't Hoff factor for
Na
2
SO
4.

(a) 0.381   (b) 2.05  (c) 2.63  (d) 3.11

10. K
sp(AgCl)
> K
sp(AgBr)
> K
sp(AgI)
. This means that:
(a) AgCl is more ionized than AgBr and AgI
(b) Both AgBr & AgI are less soluble than AgCl
(c) AgI is most soluble
(d) AgBr is more soluble than AgCl but less soluble then AgI

11. The triple point for water is:
(a) Unique      (b) Depends on a p but is independent of T
(c) Depends on T but is independent of P  (d) Depends on both P & T

12. At 25°C, the volue of Pk
b
(K
b
being the dissociation constant as a base) for NH
3
in aqueous
solution is 4.7. What is the pH of 0.1 M aqueous solution of NH
4
Cl with 0.01 M
NH
3
(approxmately):

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
(a) 8.3   (b) 9   (c) 9.5   (d) 10

13. The solution of CaF
2
(K
sp
= 3.4 × 10
–11
) in 0.1 M solution of NaF would be:
(a) 3.4 × 10
–12
M  (b) 3.4 × 10
–10
M (c) 3.4 × 10
–9
M (d) 3.4 × 10
–13
M

14. For the chemical equilibrium can be determined from which one of the following plots?
(a)  (b) (c) (d)

15. On adding 0.1 M solution each of Ag
+
, Ba
2+
and Ca
2+
in an Na
2
SO
4
solution, the species first
precipitated is (K
sp
BaSO
4
= 10
–11
, K
sp
CaSO
4
= 10
–6
, K
sp
Ag
2
SO
4
= 10
–5
):
(a) Ag
2
SO
4
(b) BaSO
4
(c) CaSO
4
(d) All of these

16. Which of the following expression for % ionization of a mono-acidic base (BOH) in aqueous
solution at appreciable concentration is correct?
(a)     (b)
(c)    (d)

17. Which of the Following is/are affected by pressure change?
(a) (b)
(c)          (d)

18. A buffer solution can be prepared from a mixture of?
(a) Sodium acetate and acetic acid in water
(b) Sodium acetate and HCl in water
(c) Ammonia and ammonium chloride in water
(d) Ammonia and sodium hydroxide in water.

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
19. The equilibrium in aqueous medium at 25
0
C shifts towards the left in
the presence of:
(a) NO
3
-
(b) Cl
-
(c) SCN
-
(d) CN
-

20. Choose the correct statements:
(a) pH of an acidic buffer increases if more salt is added
(b) pH of a basic buffer decrease if more salt is added
(c) In a saturated solution, ionic product is equal to its solubility product
(d) The term solubility product is only for sparingly soluble salts

21. The solubility of Pb(OH)
2
in water is 6.7x10
-6
M. The solubility of Pb(OH)
2
in a buffer solution
of PH=8 is 1.2x10
-x
what is the value of x.

22.  3.1 mole of FeCl
3
and 3.2 mole of NH
4
SCN are added tone litre of water. At equilibrium, 3.0
mol of FeSCN
2+
are formed. The equilibrium constant Kc of the reaction,
will be:

23.  The equilibrium of formation of phosgene is represented as:

The reaction is carried out in a 500 ml flask. At equilibrium 0.3 mole of phosgene, 0.1 mole of
CO and 0.1 mole of Cl
2
are present. The equilibrium constant of the reaction is:

24. SO
3(g)
is heated in a closed vessel. An equilibrium:  is established.
The vapour density of the mixture, in which SO
3
is 50% dissociated, is:

25. The dissociation constant of a substituted benzoic acid at 25
0
C is 1.0x10
-4
. The PH of 0.01M
solution of its sodium salt is.

26. Consider the following reversible system:
At equilibrium, there are 1.0 mole of A and 2.0 moles of each B,C
& D present. If 2.0 mole of B is added further, how many moles of C would be required to be
added so that mole of A & D do not change?

Page 5

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
Chemical Equilibrium Online Test (18
th
Dec, 16)

1. Consider the phase diagram given below:

At the intersection point Q has phases that are in equilibrium are
(a) Solid A, solid B and solid AB
2
.  (b) Solid A, solid AB
2
and liquid
(c) Solid B, solid AB
2
and liquid  (d) Solid A, solid B, solid AB
2
and
liquid
2. For the following equilibrium: calculate the equilibrium
constant, if for the equilibrium,
The equilibrium constant is 5.5 × 10
-10.
(a) 1.8 × 10
-4
(b) 1.8 × 10
-5
(c) 1.8 ×10
-6
(d) 1.8 ×10
-7

3. The elevation in boiling point of a solution of 10 g of a binary electrolyte (molecular mass
100) in 100 g of water is ? T
b
. The value of K
b
for water is:
(a)    (b) 10   (c) 1 0 ? T
b
(d)

4. For the reaction, if percentage dissociation of N
2
O
4
are 25%, 50%,
75% and 100%, then the sequence of observed vapour densities will be:
(a) d
1
> d
2
> d
3
> d
4
(b) d
4
> d
3
> d
2
> d
1

(c) d
1
= d
2
= d
3
= d
4
(d) (d
1
= d
2
) > (d
3
= d
4
)

5. For the reaction, if the initial concentration of [H
2
] = [CO
2
]
and x mol/litre of H
2
is consumed at equilibrium, the correct expression of K
p
is:
(a)   (b)   (c)   (d)

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
6. H
3
PO
4
is a tribasic acid, it undergoes ionization as:

Then, equilibrium constant for the followimg reaction will be:
(a) K
1
K
2
K
3
(b)

(c)

(d)
7. The equilibrium constant for the reaction is 5. How many moles of CO
2
litre container already containing 3 moles each of CO and H
2
O to make 2M equilibrium
concentration of CO?
(a) 15   (b) 19   (c) 5   (d) 20

8. A nitrogen–hydrogen mixture initially in the molar ratio of 1:3 reacted equilibrium to form
ammonia when 25% of the N
2
and H
2
had reached. If the total pressure of the system was 21
atm, the partial pressure of ammonia at the equilibrium was:
(a) 4.5 atm   (b) 3.0 atm  (c) 2.0 atm  (d) 1.5 atm

9. The freezing point depression constant for water is 1.86°C m
–1
. If 5 g Na
2
SO
4
is dissolved in
45 g H
2
O, the freezing point is changed by –3.82°C. Calculate the van't Hoff factor for
Na
2
SO
4.

(a) 0.381   (b) 2.05  (c) 2.63  (d) 3.11

10. K
sp(AgCl)
> K
sp(AgBr)
> K
sp(AgI)
. This means that:
(a) AgCl is more ionized than AgBr and AgI
(b) Both AgBr & AgI are less soluble than AgCl
(c) AgI is most soluble
(d) AgBr is more soluble than AgCl but less soluble then AgI

11. The triple point for water is:
(a) Unique      (b) Depends on a p but is independent of T
(c) Depends on T but is independent of P  (d) Depends on both P & T

12. At 25°C, the volue of Pk
b
(K
b
being the dissociation constant as a base) for NH
3
in aqueous
solution is 4.7. What is the pH of 0.1 M aqueous solution of NH
4
Cl with 0.01 M
NH
3
(approxmately):

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
(a) 8.3   (b) 9   (c) 9.5   (d) 10

13. The solution of CaF
2
(K
sp
= 3.4 × 10
–11
) in 0.1 M solution of NaF would be:
(a) 3.4 × 10
–12
M  (b) 3.4 × 10
–10
M (c) 3.4 × 10
–9
M (d) 3.4 × 10
–13
M

14. For the chemical equilibrium can be determined from which one of the following plots?
(a)  (b) (c) (d)

15. On adding 0.1 M solution each of Ag
+
, Ba
2+
and Ca
2+
in an Na
2
SO
4
solution, the species first
precipitated is (K
sp
BaSO
4
= 10
–11
, K
sp
CaSO
4
= 10
–6
, K
sp
Ag
2
SO
4
= 10
–5
):
(a) Ag
2
SO
4
(b) BaSO
4
(c) CaSO
4
(d) All of these

16. Which of the following expression for % ionization of a mono-acidic base (BOH) in aqueous
solution at appreciable concentration is correct?
(a)     (b)
(c)    (d)

17. Which of the Following is/are affected by pressure change?
(a) (b)
(c)          (d)

18. A buffer solution can be prepared from a mixture of?
(a) Sodium acetate and acetic acid in water
(b) Sodium acetate and HCl in water
(c) Ammonia and ammonium chloride in water
(d) Ammonia and sodium hydroxide in water.

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Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
19. The equilibrium in aqueous medium at 25
0
C shifts towards the left in
the presence of:
(a) NO
3
-
(b) Cl
-
(c) SCN
-
(d) CN
-

20. Choose the correct statements:
(a) pH of an acidic buffer increases if more salt is added
(b) pH of a basic buffer decrease if more salt is added
(c) In a saturated solution, ionic product is equal to its solubility product
(d) The term solubility product is only for sparingly soluble salts

21. The solubility of Pb(OH)
2
in water is 6.7x10
-6
M. The solubility of Pb(OH)
2
in a buffer solution
of PH=8 is 1.2x10
-x
what is the value of x.

22.  3.1 mole of FeCl
3
and 3.2 mole of NH
4
SCN are added tone litre of water. At equilibrium, 3.0
mol of FeSCN
2+
are formed. The equilibrium constant Kc of the reaction,
will be:

23.  The equilibrium of formation of phosgene is represented as:

The reaction is carried out in a 500 ml flask. At equilibrium 0.3 mole of phosgene, 0.1 mole of
CO and 0.1 mole of Cl
2
are present. The equilibrium constant of the reaction is:

24. SO
3(g)
is heated in a closed vessel. An equilibrium:  is established.
The vapour density of the mixture, in which SO
3
is 50% dissociated, is:

25. The dissociation constant of a substituted benzoic acid at 25
0
C is 1.0x10
-4
. The PH of 0.01M
solution of its sodium salt is.

26. Consider the following reversible system:
At equilibrium, there are 1.0 mole of A and 2.0 moles of each B,C
& D present. If 2.0 mole of B is added further, how many moles of C would be required to be
added so that mole of A & D do not change?

2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com
27. 0.10 mole each of SO
2
and SO
3
are mixed in a 2.0 dm
3
flask at 300K. Equilibrium is attained
as

equilibrium pressure is 281.68 kpa. The mole fraction of O
2
28. In the Reaction,  if D and d are the vapour densities at initial stage
and at equilibrium then what will be the value of  at point A in the following graph?

29. The number of degree of freedom of a system consisting of solid sucrose in equilibrium with
an aqueous solution of sucrose is:

30. 0.16 g of N
2
H
4
are dissolved in water and the total volume made up to 500 mL. Calculate the
percentage of N
2
H
4
that has reacted with water at this dilution. The K
b
for N
2
H
4
is 4.0 × 10
–
6
M:

1.  c 2.  b  3.  a 4.  a 5.  a
6.  a 7.  b 8.  b 9.  c 10.  b
11.  d 12.  a 13.  c 14.  a 15.  a
16.  a,b,d 17.  a,b,c,d 18.  a,b,c 19.  b,c,d 20.  a,b,c
21.  3 22.  145 to 155 23.  15 24.   26 to 27 25.  8
26.  6 27.  0.10 to 0.12 28.  1 29.  2 30.  2
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